Neutrino astronomy Rapporteur report I c e C u b e p r e l i m i n a r y Markus Ackermann
The young field of high-energy neutrino astrophysics 2013 ▶︎ High-energy neutrino astrophysics* started with the discovery of a cosmic neutrino flux by IceCube in 2013 ▶︎ This is year 4 in the young field of neutrino astrophysics 2017 * above MeV energies, where the sun and SN1987a had been observed in neutrinos long before. Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 2
What you should NOT expect in a very young field The Fermi LAT sky above 10 GeV Fermi LAT collaboration arXiv:1702.0066 ▶︎ Don’t expect to see a sky like this. ▶︎ 2017 is the 50th anniversary* of gamma-ray astronomy. * The first GRB was recorded by the Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 3 Vela 4 satellite on July 2nd, 1967
Year 5 in gamma-ray astronomy Kraushaar et al., ApJ, 1972 ▶︎ First full-sky map from OSO-3 satellite data. ▶︎ 621 photons recorded above 50 MeV. ▶︎ No gamma-ray sources, but galactic plane visible. Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 4
Year 5 in gamma-ray astronomy Kraushaar et al., ApJ, 1972 Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 5
The uniqueness of neutrinos ▶︎ Neutrinos allow us to peek beyond the gamma-ray horizon … ▶︎ … and into environments opaque to electromagnetic radiation . Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 6
Neutrino astrophysics at the ICRC 2017 Romero-Wolf et al., NU142 TeV - PeV neutrinos from cosmic accelerators EeV and beyond cosmogenic neutrinos (?) MeV solar and supernova neutrinos • 3 highlight talks • 55 parallel talks • 79 posters Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 7
ICRC2017 Topics ▶︎ Improving the measurement of spectrum & properties of cosmic neutrino flux ◆ 20 contributions ▶︎ Searches for the origin of the diffuse cosmic neutrino signal ◆ 34 contributions ▶︎ Modeling cosmic 𝜉 and their atmospheric backgrounds ◆ 8 contributions ▶︎ MeV neutrinos from the sun or supernovas ◆ 16 contributions ▶︎ R&D and construction of new instrumentation ◆ 47 contributions Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 8
ICRC2017 Topics ▶︎ Improving the measurement of spectrum & properties of cosmic neutrino flux ◆ 20 contributions My sincere apologies for all the fantastic ▶︎ Searches for the origin of the diffuse cosmic neutrino signal contributions that I cannot highlight ◆ 34 contributions ▶︎ Modeling cosmic 𝜉 and their atmospheric in the next 30+ minutes backgrounds ◆ 8 contributions ▶︎ MeV neutrinos from the sun or supernovas ◆ 16 contributions ▶︎ R&D and construction of new instrumentation ◆ 47 contributions Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 8
ICRC2017 Topics ▶︎ Improving the measurement of spectrum & properties of the cosmic neutrino flux ◆ 20 contributions ▶︎ Searches for the origin of the diffuse cosmic neutrino signal ◆ 34 contributions ▶︎ Modeling cosmic 𝜉 and their atmospheric backgrounds ◆ 8 contributions ▶︎ MeV neutrinos from the sun / supernovas ◆ 16 contributions ▶︎ R&D and construction of new instrumentation ◆ 47 contributions Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 9
Cosmic neutrinos two years ago (ICRC 2015) IceCube collaboration, PoS(ICRC2015)1066 4 years 𝛿 =2.3 , E cut =2.7 PeV HE starting events 𝛿 = 2.5 3 years PL or PL+ exp. cutoff fit all IceCube data through-going muons 2 years showers ▶︎ Global analysis of multiple event samples from IceCube. ▶︎ No indications for anisotropies or point sources . ▶︎ No neutrinos beyond PeV energies Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 10
Cosmic neutrinos at ICRC 2017 C. Kopper, PoS 981 Energy range: >60 TeV 6 years HE starting events 𝛿 = 2.9 8 years through-going muons 4 years C.Haack, PoS 1005 showers 𝛿 = 2.2 Energy range: 120 TeV - 5 PeV Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 11
Cosmic neutrinos at ICRC 2017 6 years H. Niederhausen, PoS 968 HE starting events 7 years 𝛿 = 2.5 through-going muons 4 years Energy range: 12 TeV - 2.1 PeV showers Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 12
A comparison of the spectral parameters H. Niederhausen, PoS 968 2 years showers 4 (more) years showers 8 years through-going muons Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 13
A comparison of the spectral parameters H. Niederhausen, PoS 968 2 years showers 4 (more) years showers 6 years 8 years HE starting events through-going muons Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 13
An update to the IceCube global fit Flavor composition sensitivity C. Weaver, PoS 976 ▶︎ Global fit is needed to properly evaluate spectral and flavor composition constraints ▶︎ In preparation but no results shown here. ▶︎ Expect results “later this fall”. Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 14
Astrophysical tau neutrinos M. Usner, PoS 974 ▶︎ Search for characteristic 𝜉 𝜐 signature ▶︎ Sensitive to 𝜉 𝜐 with E > 100 TeV ▶︎ No tau neutrino candidate found in starting event sample. Consistent with fluctuation. ▶︎ Future analysis will be extended to other data samples: up to 50% more expected 𝜉 𝜐 candidates J. Stachurska, PoS 973 Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 15
Improving the sensitivity for PeV and beyond L. Lu, PoS 1002 ▶︎ Neutrino interactions at the edge of the instrumented volume of IceCube. ▶︎ New PeV event found that might be the highest energy neutrino observed yet. ▶︎ Background probability and energy reconstruction not finally assessed . Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 16
Delayed pulses from neutron capture Li, Bustamante & Beacom, arXiv:1606.06290 Simulation, NC events 100 TeV < E < 150 TeV A. Steuer, PoS 1008 IceCube data ▶︎ Delayed emission from neutron 1500 < N PE < 6000 capture can be used to distinguish (background dominated) hadronic from EM showers. ▶︎ Needs dedicated readout concept, operational since Feb 2016 . ▶︎ Promising for E>100 TeV showers Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 17
Cosmogenic neutrinos Highlight talk by J. Alvarez-Muniz E. Zas, PoS 972 S. Yoshida, PoS 975 Romero-Wolf, NU142 ▶︎ Still no cosmogenic neutrinos found. ▶︎ Candidate radio event observed by ANITA. ▶︎ Would be inconsistent with AUGER / IceCube observations Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 18
ICRC2017 Topics ▶︎ Improving the measurement of spectrum & properties of the cosmic neutrino flux ◆ 20 contributions ▶︎ Searches for the origin of the diffuse cosmic neutrino signal ◆ 34 contributions ▶︎ Modeling cosmic 𝜉 and their atmospheric backgrounds ◆ 8 contributions ▶︎ MeV neutrinos from the sun / supernovas ◆ 16 contributions ▶︎ R&D and construction of new instrumentation ◆ 47 contributions Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 19
Searches for cosmic neutrino sources G. Illuminati, PoS 986 ▶︎ ANTARES is more sensitive than IceCube on parts of the Southern sky ▶︎ No point / extended sources of neutrinos found Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 20
Search for neutrino emission from extended sources Sensitivity (90% CL uppe limit) ▶︎ 7 years of IceCube data were searched for evidence of an extended neutrino source . ▶︎ Source radii between 1º and 5º tested. ▶︎ No indications found. E.Pinat, PoS 963 r src =2º r src =5º Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 21
Search for neutrinos from transients ▶︎ No significant correlation found with: ◆ Gamma-ray bursts S.Celli, PoS 988 ◆ Blazar flares A. Sanchez-Loza, PoS 971 M. Organokov, PoS 946 C. Raab, PoS 957 T. Kintscher, PoS 969 ◆ Fast radio bursts M. Sanguineti, PoS 1053 D. Xu, PoS 980 ◆ Gravitational wave events T. Pradier, PoS 947 ◆ X-ray flares A. Keivani, PoS 1015 ◆ X-ray binaries A. Sanchez-Loza, PoS 970 ◆ Supernovae Meagher, PoS 1007 ◆ IceCube events G. Illuminati, PoS 987 Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea | 22
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